Quickstart

Make your first call against any of 50+ scientific & civic APIs in under 5 minutes.

1. 1

   Sign in & get an API key

   Sign in with your Google account at /auth/signin and create an API key from your dashboard. Free tier: 30,000 requests / month across all APIs.

   Your key looks like ppn_live_xxxx…. Treat it like a password.

2. 2

   Pick an API

   Browse the catalog for the human-readable list, or fetch /catalog.json for a machine-readable directory with the URL of each API's OpenAPI spec.

   Every API has an interactive Try-it-out page at {api}/docs (powered by Scalar — paste your API key once and call any endpoint live).

3. 3

   Call it

   Example: get the elevation of Tokyo Station from the Onokoro API.

   curl -H "Authorization: Bearer ppn_live_xxxx" \
     "https://api.onokoro.org/api/v1/elevation?lat=35.6812&lon=139.7671"

   Most public endpoints work without authentication for trial requests; rate limits and feature flags kick in once you authenticate.